Your entire analysis rests on this point, which you fail to demonstrate. (You also cite zero sources, which isn't encouraging.)
(EDIT: This assumption is conservative, but reasonable.)
Was this AI generated?
> The cable itself costs virtually nothing
Did you attempt to look up the cost of laying new fibre trunk?
> due to their Satellites now being massively overbooked, speeds went down months to months
Then this isn't a remote location. Starlink's economics have been pretty obvious for anyone who has been on a plane, boat or train in the last decade. They're also terrifically useful for remote mining, observation and military operations.
> people noticed that it is actually cheaper to run 10 KILOMETERS / 6 Miles of Fiber cable through the jungle
Well sure, if you ignore negative exernalities a lot of stuff is cheap.